# Gas spring end fittings: eyelet and fitting threads M3.5–M14, ball studs Ø8 / Ø10 / Ø13 (M4–M10), ball sockets and forks

> What thread do gas spring end fittings use, and what size is the 10 mm ball stud and ball socket?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- Basis: McMaster-Carr's eyelet end-fitting thread table, Lesjöfors' ball stud list (ball diameter, thread, thread length, spanner width), and nb-parts' end-fitting list by thread; numbers only
- Page: https://xemstudio.com/objects/gas-spring-end-fittings/ · JSON: https://xemstudio.com/api/geometry?object=gas-spring-end-fittings · Plain text: https://xemstudio.com/objects/gas-spring-end-fittings/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- McMaster-Carr eyelet fittings screw onto the gas spring end thread: M3.5 × 0.6, M5 × 0.8, M6 × 1, M8 × 1.25, M10 × 1.5 and M14 × 1.5 (mm) in zinc alloy, zinc-plated steel, 303 / 316 stainless, aluminum or nylon, with the part numbers shown. The page tells the buyer to match the fitting's thread to the spring's rod and end thread, and each fitting adds its own length to the extended and compressed lengths (see gas-springs-series-and-strokes).
- Lesjöfors ball studs (d1 = ball diameter, thread, thread length l2, spanner width SW, in mm): BS1 Ø8 M4, BS2 Ø10 M6, BS3 and BS6 Ø10 M8 (steel and AISI 303), BS5 Ø13 M10 and BS7 Ø13 M8, as read from the page. So the common '10 mm ball' stud comes with an M6 or M8 thread; the 13 mm ball with M8 or M10.
- Ball sockets: a Stabilus catalogue caption names 'ball studs according to DIN 71803 Ø10' as the mating stud for its ball-socket brackets, and McMaster's fitting assortments list ball sockets for 10 mm, 13 mm and 16 mm balls; no socket dimension table was readable, so socket depth and snap force are not given. A machine reading of McMaster's fitting-assortment table mixed the socket's thread with the stud's (a 5/16-18 stud thread appeared next to metric sockets); those stud threads are not used.
- nb-parts' list is by gas-spring end thread (M5 to M14): the catalogue names ball sockets (WG, KP), eyelets, forks (G), plastic sockets (PKP) and spacers with the sizes in each designation. The designations are the maker's; read the maker's table for the dimensions.
- Related: RAM-style ball sizes (ram-mount-ball-sizes) and the 17 mm phone-mount ball (phone-mount-ball-17mm) are different balls. No file: no socket or eyelet profile is given as numbers in the sources read. McMaster-Carr sells end fittings with per-part STEP; linked, not copied.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| end-fitting thread | M3.5 x 0.6, M5 x 0.8, M6 x 1, M8 x 1.25, M10 x 1.5, M14 x 1.5 (McMaster-Carr eyelet fittings) | rod or tube end thread of the gas spring with the same thread (SUSPA 16-3 prints M6 x 1.0 rod end and M8 x 1.0 tube end) | designed | all |
| ball stud Ø10 | Ø10 ball on an M6 (thread 11 mm, SW 8) or M8 (thread 12 mm, SW 13) stud (Lesjofors BS2, BS3 / BS6) | Ø10 ball socket on the gas spring end fitting ('ball studs according to DIN 71803 Ø10', Stabilus caption) | designed | all |

## Sizes

| source | thread | material | ball Ø | thread length | spanner width | part / designation |
|---|---|---|---|---|---|---|
| McMaster-Carr eyelet end fitting | M3.5 × 0.6 | zinc-plated steel | — | — | — | 9416K421 |
| McMaster-Carr eyelet end fitting | M3.5 × 0.6 | 316 stainless steel | — | — | — | 9424K18 |
| McMaster-Carr eyelet end fitting | M5 × 0.8 | 303 stainless steel | — | — | — | 9424K19 |
| McMaster-Carr eyelet end fitting | M6 × 1 | zinc alloy | — | — | — | 9416K422, 9416K423, 9416K84, 6465K61, 6465K112 |
| McMaster-Carr eyelet end fitting | M6 × 1 | 316 stainless steel | — | — | — | 9424K14 |
| McMaster-Carr eyelet end fitting | M6 × 1 | nylon (nonsparking) | — | — | — | 6465K26 |
| McMaster-Carr eyelet end fitting | M8 × 1.25 | zinc alloy | — | — | — | 9416K88, 6465K63, 6465K27 |
| McMaster-Carr eyelet end fitting | M8 × 1.25 | zinc-plated steel | — | — | — | 9416K424 |
| McMaster-Carr eyelet end fitting | M8 × 1.25 | 316 stainless steel | — | — | — | 9424K15 |
| McMaster-Carr eyelet end fitting | M8 × 1.25 | aluminum (lightweight) | — | — | — | 9428K3 |
| McMaster-Carr eyelet end fitting | M10 × 1.5 | zinc-plated steel | — | — | — | 9416K425 |
| McMaster-Carr eyelet end fitting | M10 × 1.5 | 316 stainless steel | — | — | — | 9424K16, 9424K911 |
| McMaster-Carr eyelet end fitting | M10 × 1.5 | aluminum (lightweight) | — | — | — | 9416K666 |
| McMaster-Carr eyelet end fitting | M14 × 1.5 | zinc-plated steel | — | — | — | 6465K111 |
| Lesjöfors ball stud | M4 | steel | ball Ø8 mm | thread length l2 9 mm | SW 7 mm | BS1 (604) |
| Lesjöfors ball stud | M6 | steel | ball Ø10 mm | thread length l2 11 mm | SW 8 mm | BS2 (4616) |
| Lesjöfors ball stud | M8 | steel | ball Ø10 mm | thread length l2 12 mm | SW 13 mm | BS3 (4610) |
| Lesjöfors ball stud | M8 | AISI 303 stainless | ball Ø10 mm | thread length l2 12 mm | SW 13 mm | BS6 (S1139) |
| Lesjöfors ball stud | M10 | steel | ball Ø13 mm | thread length l2 20 mm | SW 17 mm | BS5 (8272) |
| Lesjöfors ball stud | M8 | steel | ball Ø13 mm | thread length l2 16.5 mm | SW 11 mm | BS7 (62600) |
| nb-parts end fittings by thread (as listed) | M5 | see list | — | — | — | WG S 10x19 (M5/M6, M5/M8), KP 10x19-M5, KUZA 10-M6x12 / M8x13, fork G5x10-M5, eyelet 6.1-6x16-M5 |
| nb-parts end fittings by thread (as listed) | M6 | see list | — | — | — | WG CS 10 (x19 or x25; M6/M6, M6/M8), KP B 10 (x19 or x25), WG S 10, KP 10, PKP 10 (plastic socket), KUZA 10, fork G 6x12-M6, eyelets 8.1 mm |
| nb-parts end fittings by thread (as listed) | M8 | see list | — | — | — | WG CS 13 (x20 / x25 / x30), KP B 13, WG S 10 (M8/M6, M8/M8), KP 10x19-M8, KUZA 10 / 13, fork G 8x16-M8, eyelets 8.1 / 10.1, spacers M8x34 / M8x58 |
| nb-parts end fittings by thread (as listed) | M10 | see list | — | — | — | WG CS 16 (x30 / x35), KP B 16x30, forks G 10x20, G 10x40 and G 8x16, eyelets 8.1 / 10.1 / 12.1, spacers M10x22 / M10x50 |
| nb-parts end fittings by thread (as listed) | M14 | see list | — | — | — | WG CS 19x45 (M14x1.5 / M14), fork G 14x28, eyelet 14.1-14x40 |

## Where the files are

- McMaster-Carr: [Gas springs, McMaster-Carr 'About gas springs' (eyelet series, adjustable-force stainless series, end fittings) (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/gas-spring-fitting-eyelets) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- Lesjofors: [Gas spring ball studs: BS1 (Ø8, M4), BS2 (Ø10, M6), BS3 / BS6 (Ø10, M8), BS5 (Ø13, M10), BS7 (Ø13, M8): thread length l2, spanner width SW](https://shop.lesjofors.com/de/en-US/all-products/gas-springs/end-fittings-and-accessories/end-fittings/ball-studs-p-1022/) — web — Maker product page; numbers only
- nb-parts: [Gas springs catalogue: Ø pairs, end thread, stroke ranges and end fittings (M3.5 to M24, ball sockets, eyelets, forks)](https://www.nb-parts.de/pdf/catalogues/nb-parts_gas-springs_en.pdf) — web — Maker catalogue; numbers only. The source text does not label which Ø of a pair is the rod
- McMaster-Carr: [Mechanical struts and gas springs (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/mechanical-struts/) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- Stabilus (catalogue host page): [Standard-program catalogue captions: ball-socket brackets 'suitable for ball studs according to DIN 71803 Ø10'](https://pdf.directindustry.com/pdf/stabilus/standard-program-gas-springs/7206-412283.html) — web — Not used for numbers; see notes

## Questions

**What thread does a 10 mm ball stud have?**

Lesjöfors lists the Ø10 ball stud with an M6 thread (11 mm thread length, SW 8) and with an M8 thread (12 mm, SW 13); the Ø8 ball has M4 and the Ø13 ball M8 or M10.

**What are the threads of gas spring eyelet fittings?**

M3.5 × 0.6, M5 × 0.8, M6 × 1, M8 × 1.25, M10 × 1.5 and M14 × 1.5 mm on McMaster-Carr's page.

**Which DIN covers the 10 mm gas spring ball?**

A Stabilus catalogue caption says 'ball studs according to DIN 71803 Ø10'; the DIN sheet itself was not read.

## Fits with

- [Gas springs and gas struts: rod / tube diameters, end threads, stroke and extended-length series (nb-parts, SUSPA 16-3, McMaster-Carr)](https://xemstudio.com/objects/gas-springs-series-and-strokes/)
- [RAM-style mount ball sizes: A 0.56, B 1, C 1.5, D 2.25 and E 3.38 in](https://xemstudio.com/objects/ram-mount-ball-sizes/)
- [17 mm ball joint for phone mounts (ball stud)](https://xemstudio.com/objects/phone-mount-ball-17mm/)
- [Clevis pins ISO 2341 B, Ø3 to Ø8](https://xemstudio.com/objects/clevis-pins/)
- [Compression springs, wire Ø0.5–1.6, OD 6–16](https://xemstudio.com/objects/compression-springs/)